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The bloodline of the wasteland's most influential tribesman extends all the way back to the Vault Dweller and his spouse, Pat. As the child of the village's elder, the Chosen One is a member of the third generation of former Vault 13 dwellers living outside the vault, similar to how their grandparents were the third generation to live in a vault.

The Chosen One was trained from birth to become the tribe's champion and, in the future, their elder. Part of these trials were drug sessions with Hakunin. The final stage of the Chosen One's development was the Temple of Trials, a trial the Chosen One's mother also completed long ago. Their training complete, the Chosen One was sent out by the people of Arroyo to find a Garden of Eden Creation Kit which could make the failing village thrive once more.

In Vault 15, they killed Darion, leader of the New Khans, thereby freeing the local squatters from the gang's tyranny. They also quickened the expansion of the New California Republic by helping to strike a deal between the squatters and the NCR government, which further resulted in the Khans getting hunted to near extinction for the second time.

In Navarro, the drill sergeant mistook the Chosen One for a private without his uniform. The Chosen One freed Xarn[1], repaired motivator K-9 and left him in NCR so that he could receive necessary repairs from Dorothy.[1]

Eventually the Chosen One found the G.E.C.K., but also discovered that the Enclave, a remnant of the old United States' shadow government, had abducted the people of Arroyo. This led them to uncover the conspiracy to develop a FEV specimen, which would be used to rid the wasteland of what the Enclave deemed to be impure and mutated forms of humanity.

The Chosen One eventually found the Enclave's headquarters, an old Poseidon Energy oil rig in the Pacific Ocean. The Arroyo villagers were freed as well as the inhabitants of Vault 13, who were also abducted by the Enclave for their experiments. During their escape, the Chosen One was confronted by Frank Horrigan. Horrigan was slain in battle, either by the Chosen One or renegade Enclave soldiers, but not before activating a nuclear warhead in the hope of destroying the Chosen One along with the Enclave. He escaped on the oil tanker along with the tribals and the Vault 13 dwellers.

With the GECK, the Chosen One, along with the Arroyo tribals and the Vault 13 dwellers, founded the city of New Arroyo and reunited the two bloodlines that had been separated for three generations. The village elder, pleased with the reunion, found peace and passed away a few months later, leaving the leadership of the village to the Chosen One.

With the combination of the vault dwellers' technical knowledge and the tribals' survival skills, New Arroyo thrived under the Chosen One's rule, and grew into a powerful civilization.

Marcus, in particular, was inspired by the Chosen One's example, and after the uranium mine in Broken Hills ran dry and the place was deserted, he wandered east, eventually founding Jacobstown in the Mojave Wasteland. The Courier may ask about the Chosen One to which Marcus replies he never found out what happened to him after they disbanded, but had a feeling that everything worked out for them in the end.

The Chosen One was also remembered by other individuals. While not being born at the time it happened, Klamath Bob still would tell stories about a tribal that visited the town of Klamath and stirred up the place and Cannibal Johnson would reminisce of the Chosen One's visit to Navarro.

Via the Guardian of Foreverrandom encounter, the Chosen One can go back in time and break Vault 13's water chip, setting the events of Fallout, and by extension, Fallout 2, into motion. This event is, however, a nod to Star Trek, and not considered canon.

In Fallout: New Vegas, the Chosen One and their actions in Fallout 2 is passingly mentioned by several characters:

Jas Wilkins mentions that her Great-Aunt Rose had a deathclaw for laying eggs, until it was shot in the eye by a stranger.

Marcus recalls his adventures in Fallout 2, in which he says how he helped a tribal search for a G.E.C.K. and nuked an oil rig in the process, suggesting he was with the Chosen One up until the conclusion of Fallout 2.

Klamath Bob mentions that life in Klamath was made a little more exciting for a while when "this tribal from Arroyo" visited the town years back, although he mentions that this was "before [his] time."

Ezekiel references "itinerant heroes," one of which destroyed the Khans and believed to have dealt a similar fate to the New Khans, though he states the dates would then be wrong. The fate of the New Khans may be a reference to the Chosen One.[3]